import java.math.*;
import java.util.*;


public class BigIntegerTest {

  public static void main(String[] args) {

    Scanner in = new Scanner(System.in);

    System.out.print("How many numbers do you need to draw? ");
    int n = in.nextInt();

    System.out.print("What is the highest number you can draw? ");
    int k = in.nextInt();

    BigInteger lotteryOdds = BigInteger.valueOf(1);

    for (int i = 1; i <= k; i++)
      lotteryOdds = lotteryOdds.multiply(BigInteger.valueOf(n - i + 1)).divide(BigInteger.valueOf(i));

    System.out.println("Your odds are 1 in " + lotteryOdds + ". Good luck!");
  }

}
